Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea78dfa81417fb9…

MALICIOUS

PDF

90.9 KB Created: 2021-10-07 00:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 881337d3549f37304a84ca3e175a7c88 SHA-1: 07c8a8dd9591c09755179552fa01ebc19d694c6e SHA-256: fea78dfa81417fb99ff4532b1e04595d39faa3576907df8dff255a292c2851a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/85f2l6fuu6maq4ea20ve5l3iod/6270806102.pdf In PDF document text
    • http://stylekd.ru/files/gegewaluvi.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/mefaxiw.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f87c00d598b84569e6c3e57b62fd4071/21364458667.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/51856245783.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210928223355.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae202a9c4d---64944735741.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/todulik.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/45494085607.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/tevimefezi.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/wuwutazokabobapirog.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/3516727552.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/28409900216.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/59980898049.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/nosanozosezemawixud.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/murufitelobotafo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/49997071464.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202110070501353809.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe1c411a5---92876436640.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/18959308287.pdfIn PDF document text
    • https://kysig.com/app/webroot/userfiles/files/zumeror.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/90190139931.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/28182758317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=plot+of+the+story+the+lotteryPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 10068 bytes
SHA-256: 75034c7cbf80ce0ec5209ecb0a640121e0188654a3a636af2189e99d2e64b2b0
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 21552 bytes
SHA-256: e7d8016f23b1beb7fe4143570c0cd4f34b4738ad2aeec8013b42d956f98f011a
font_02_sfnt_off000145df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1